On Fri, Dec 13, 2019 at 04:12:29PM +0200, Stanislav Lisovskiy wrote:
> Currently intel_can_enable_sagv function contains
> a mix of workarounds for different platforms
> some of them are not valid for gens >= 11 already,
> so lets split it into separate functions.
>
> v2:
> - Rework watermark calculation algorithm to
> attempt to calculate Level 0 watermark
> with added sagv block time latency and
> check if it fits in DBuf in order to
> determine if SAGV can be enabled already
> at this stage, just as BSpec 49325 states.
> if that fails rollback to usual Level 0
> latency and disable SAGV.
> - Remove unneeded tabs(James Ausmus)
>
> v3: Rebased the patch
>
> v4: - Added back interlaced check for Gen12 and
> added separate function for TGL SAGV check
> (thanks to James Ausmus for spotting)
> - Removed unneeded gen check
> - Extracted Gen12 SAGV decision making code
> to a separate function from skl_compute_wm
>
> v5: - Added SAGV global state to dev_priv, because
> we need to track all pipes, not only those
> in atomic state. Each pipe has now correspondent
> bit mask reflecting, whether it can tolerate
> SAGV or not(thanks to Ville Syrjala for suggestions).
> - Now using active flag instead of enable in crc
> usage check.
>
> v6: - Fixed rebase conflicts
>
> v7: - kms_cursor_legacy seems to get broken because of multiple memcpy
> calls when copying level 0 water marks for enabled SAGV, to
> fix this now simply using that field right away, without copying,
> for that introduced a new wm_level accessor which decides which
> wm_level to return based on SAGV state.
>
> v8: - Protect crtc_sagv_mask same way as we do for other global state
> changes: i.e check if changes are needed, then grab all crtc locks
> to serialize the changes(Ville Syrjälä)
> - Add crtc_sagv_mask caching in order to avoid needless recalculations
> (Matthew Roper)
> - Put back Gen12 SAGV switch in order to get it enabled in separate
> patch(Matthew Roper)
> - Rename *_set_sagv_mask to *_compute_sagv_mask(Matthew Roper)
> - Check if there are no active pipes in intel_can_enable_sagv
> instead of platform specific functions(Matthew Roper), same
> for intel_has_sagv check.
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxx>
> Cc: James Ausmus <james.ausmus@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 12 +-
> .../drm/i915/display/intel_display_types.h | 9 +
> drivers/gpu/drm/i915/i915_drv.h | 6 +
> drivers/gpu/drm/i915/intel_pm.c | 416 +++++++++++++++---
> drivers/gpu/drm/i915/intel_pm.h | 1 +
> 5 files changed, 393 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 0f37f1d2026d..d58c70fbc08e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13379,7 +13379,10 @@ static void verify_wm_state(struct intel_crtc *crtc,
> /* Watermarks */
> for (level = 0; level <= max_level; level++) {
> if (skl_wm_level_equals(&hw_plane_wm->wm[level],
> - &sw_plane_wm->wm[level]))
> + &sw_plane_wm->wm[level]) ||
> + (skl_wm_level_equals(&hw_plane_wm->wm[level],
> + &sw_plane_wm->sagv_wm0) &&
> + (level == 0)))
> continue;
>
> DRM_ERROR("mismatch in WM pipe %c plane %d level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
> @@ -13431,7 +13434,10 @@ static void verify_wm_state(struct intel_crtc *crtc,
> /* Watermarks */
> for (level = 0; level <= max_level; level++) {
> if (skl_wm_level_equals(&hw_plane_wm->wm[level],
> - &sw_plane_wm->wm[level]))
> + &sw_plane_wm->wm[level]) ||
> + (skl_wm_level_equals(&hw_plane_wm->wm[level],
> + &sw_plane_wm->sagv_wm0) &&
> + (level == 0)))
> continue;
>
> DRM_ERROR("mismatch in WM pipe %c cursor level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
> @@ -14808,6 +14814,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
> dev_priv->display.optimize_watermarks(state, crtc);
> }
>
> + dev_priv->crtc_sagv_mask = state->crtc_sagv_mask;
> +
> for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
> intel_post_plane_update(state, crtc);
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 83ea04149b77..5301e1042b40 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -490,6 +490,14 @@ struct intel_atomic_state {
> */
> u8 active_pipe_changes;
>
> + /*
> + * Contains a mask which reflects whether correspondent pipe
> + * can tolerate SAGV or not, so that we can make a decision
> + * at atomic_commit_tail stage, whether we enable it or not
> + * based on global state in dev_priv.
> + */
> + u32 crtc_sagv_mask;
Fits in u8, s/crtc/pipe/ so we don't get confused.
> +
> u8 active_pipes;
> /* minimum acceptable cdclk for each pipe */
> int min_cdclk[I915_MAX_PIPES];
> @@ -670,6 +678,7 @@ struct skl_plane_wm {
> struct skl_wm_level wm[8];
> struct skl_wm_level uv_wm[8];
> struct skl_wm_level trans_wm;
> + struct skl_wm_level sagv_wm0;
> bool is_planar;
> };
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 0781b6326b8c..b877c42213c4 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1171,6 +1171,12 @@ struct drm_i915_private {
>
> u32 sagv_block_time_us;
>
> + /*
> + * Contains a bit mask, whether correspondent
> + * pipe allows SAGV or not.
> + */
> + u32 crtc_sagv_mask;
ditto.
> +
> struct {
> /*
> * Raw watermark latency values:
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index ccbbdf4a6aab..d70c33df0bbf 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3647,7 +3647,7 @@ static bool skl_needs_memory_bw_wa(struct drm_i915_private *dev_priv)
> return IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv);
> }
>
> -static bool
> +bool
> intel_has_sagv(struct drm_i915_private *dev_priv)
> {
> /* HACK! */
> @@ -3770,7 +3770,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
> return 0;
> }
>
> -bool intel_can_enable_sagv(struct intel_atomic_state *state)
> +static void skl_compute_sagv_mask(struct intel_atomic_state *state)
> {
> struct drm_device *dev = state->base.dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> @@ -3780,29 +3780,15 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
> enum pipe pipe;
> int level, latency;
>
> - if (!intel_has_sagv(dev_priv))
> - return false;
> -
> - /*
> - * If there are no active CRTCs, no additional checks need be performed
> - */
> - if (hweight8(state->active_pipes) == 0)
> - return true;
> -
> - /*
> - * SKL+ workaround: bspec recommends we disable SAGV when we have
> - * more then one pipe enabled
> - */
> - if (hweight8(state->active_pipes) > 1)
> - return false;
> -
> /* Since we're now guaranteed to only have one active CRTC... */
> pipe = ffs(state->active_pipes) - 1;
> crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
> crtc_state = to_intel_crtc_state(crtc->base.state);
> + state->crtc_sagv_mask &= ~BIT(crtc->pipe);
>
> - if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
> - return false;
> + if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
> + return;
> + }
>
> for_each_intel_plane_on_crtc(dev, crtc, plane) {
> struct skl_plane_wm *wm =
> @@ -3830,6 +3816,136 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
> * can't enable SAGV.
> */
> if (latency < dev_priv->sagv_block_time_us)
> + return;
> + }
> +
> + state->crtc_sagv_mask |= BIT(crtc->pipe);
> +}
Looks like we can keep this as a pure function and leave it up to the
caller to update the mask. Much easier on the brain to deal with pure
functions.
> +
> +static void tgl_compute_sagv_mask(struct intel_atomic_state *state);
> +
> +static void icl_compute_sagv_mask(struct intel_atomic_state *state)
> +{
> + struct drm_device *dev = state->base.dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + struct intel_crtc *crtc;
> + struct intel_crtc_state *new_crtc_state;
> + int level, latency;
> + int i;
> + int plane_id;
> +
> + for_each_new_intel_crtc_in_state(state, crtc,
> + new_crtc_state, i) {
> + unsigned int flags = crtc->base.state->adjusted_mode.flags;
> + bool can_sagv;
> +
> + if (flags & DRM_MODE_FLAG_INTERLACE)
> + continue;
> +
> + if (!new_crtc_state->hw.active)
> + continue;
> +
> + can_sagv = true;
> + for_each_plane_id_on_crtc(crtc, plane_id) {
> + struct skl_plane_wm *wm =
> + &new_crtc_state->wm.skl.optimal.planes[plane_id];
> +
> + /* Skip this plane if it's not enabled */
> + if (!wm->wm[0].plane_en)
> + continue;
> +
> + /* Find the highest enabled wm level for this plane */
> + for (level = ilk_wm_max_level(dev_priv);
> + !wm->wm[level].plane_en; --level) {
> + }
> +
> + latency = dev_priv->wm.skl_latency[level];
> +
> + /*
> + * If any of the planes on this pipe don't enable
> + * wm levels that incur memory latencies higher than
> + * sagv_block_time_us we can't enable SAGV.
> + */
> + if (latency < dev_priv->sagv_block_time_us) {
> + can_sagv = false;
> + break;
> + }
Hmm. What's the difference between this and the skl version?
> + }
> + if (can_sagv)
> + state->crtc_sagv_mask |= BIT(crtc->pipe);
> + else
> + state->crtc_sagv_mask &= ~BIT(crtc->pipe);
> + }
> +}
> +
> +bool intel_can_enable_sagv(struct intel_atomic_state *state)
This seems to do a double duty: compute the mask, and return whether we
can enable sagv. Those two things should be separate funtions IMO.
> +{
> + struct drm_device *dev = state->base.dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + int ret, i;
> + struct intel_crtc *crtc;
> + struct intel_crtc_state *new_crtc_state;
> +
> + if (!intel_has_sagv(dev_priv))
> + return false;
> +
> + /*
> + * Check if we had already calculated the mask.
> + * if we had - then we already have global state,
> + * serialized and thus protected from changes from
> + * other commits and able to use cached version here.
> + */
> + if (!state->crtc_sagv_mask) {
> + /*
> + * If there are no active CRTCs, no additional
> + * checks need be performed
> + */
> + if (hweight8(state->active_pipes) == 0)
> + return false;
> +
> + /*
> + * Make sure we always pick global state first,
> + * there shouldn't be any issue as we hold only locks
> + * to correspondent crtcs in state, however once
> + * we detect that we need to change SAGV mask
> + * in global state, we will grab all the crtc locks
> + * in order to get this serialized, thus other
> + * racing commits having other crtc locks, will have
> + * to start over again, as stated by Wound-Wait
> + * algorithm.
> + */
> + state->crtc_sagv_mask = dev_priv->crtc_sagv_mask;
> +
> + if (INTEL_GEN(dev_priv) >= 12)
> + tgl_compute_sagv_mask(state);
> + else if (INTEL_GEN(dev_priv) == 11)
> + icl_compute_sagv_mask(state);
> + else
> + skl_compute_sagv_mask(state);
> +
> + /*
> + * For SAGV we need to account all the pipes,
> + * not only the ones which are in state currently.
> + * Grab all locks if we detect that we are actually
> + * going to do something.
> + */
> + if (state->crtc_sagv_mask != dev_priv->crtc_sagv_mask) {
> + ret = intel_atomic_serialize_global_state(state);
> + if (ret) {
> + DRM_DEBUG_KMS("Could not serialize global state\n");
> + return false;
> + }
> + }
> + }
> +
> + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
> + u32 mask = BIT(crtc->pipe);
> + bool state_sagv_masked = (mask & state->crtc_sagv_mask) == 0;
> +
> + if (!new_crtc_state->hw.active)
> + continue;
> +
> + if (state_sagv_masked)
> return false;
> }
>
> @@ -3955,6 +4071,7 @@ static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
> int color_plane);
> static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
> int level,
> + u32 latency,
Passing in the latency could be split into a separate trivial patch.
> const struct skl_wm_params *wp,
> const struct skl_wm_level *result_prev,
> struct skl_wm_level *result /* out */);
> @@ -3977,7 +4094,10 @@ skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
> WARN_ON(ret);
>
> for (level = 0; level <= max_level; level++) {
> - skl_compute_plane_wm(crtc_state, level, &wp, &wm, &wm);
> + u32 latency = dev_priv->wm.skl_latency[level];
> +
> + skl_compute_plane_wm(crtc_state, level, latency, &wp, &wm, &wm);
> +
> if (wm.min_ddb_alloc == U16_MAX)
> break;
>
> @@ -4242,6 +4362,98 @@ icl_get_total_relative_data_rate(struct intel_crtc_state *crtc_state,
> return total_data_rate;
> }
>
> +static int
> +tgl_check_pipe_fits_sagv_wm(struct intel_crtc_state *crtc_state,
> + struct skl_ddb_allocation *ddb /* out */)
> +{
> + struct drm_crtc *crtc = crtc_state->uapi.crtc;
> + struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + struct skl_ddb_entry *alloc = &crtc_state->wm.skl.ddb;
> + u16 alloc_size;
> + u16 total[I915_MAX_PLANES] = {};
> + u64 total_data_rate;
> + enum plane_id plane_id;
> + int num_active;
> + u64 plane_data_rate[I915_MAX_PLANES] = {};
> + u32 blocks;
> +
> + /*
> + * No need to check gen here, we call this only for gen12
> + */
> + total_data_rate =
> + icl_get_total_relative_data_rate(crtc_state,
> + plane_data_rate);
> +
> + skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state,
> + total_data_rate,
> + ddb, alloc, &num_active);
> + alloc_size = skl_ddb_entry_size(alloc);
> + if (alloc_size == 0)
> + return -ENOSPC;
> +
> + /* Allocate fixed number of blocks for cursor. */
> + total[PLANE_CURSOR] = skl_cursor_allocation(crtc_state, num_active);
> + alloc_size -= total[PLANE_CURSOR];
> + crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].start =
> + alloc->end - total[PLANE_CURSOR];
> + crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].end = alloc->end;
Why are we recomputing the cursor ddb here?
> +
> + /*
> + * Do check if we can fit L0 + sagv_block_time and
> + * disable SAGV if we can't.
> + */
> + blocks = 0;
> + for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> + const struct skl_plane_wm *wm =
> + &crtc_state->wm.skl.optimal.planes[plane_id];
> +
> + if (plane_id == PLANE_CURSOR) {
> + if (WARN_ON(wm->sagv_wm0.min_ddb_alloc >
> + total[PLANE_CURSOR])) {
> + blocks = U32_MAX;
> + break;
> + }
> + continue;
> + }
> +
> + blocks += wm->sagv_wm0.min_ddb_alloc;
> + if (blocks > alloc_size)
> + return -ENOSPC;
> + }
Looks like lots of copy paste. Please refactor if you think the
current code is useful for this.
But I don't really see why this is here. AFAICS we should just
include the sagv wm as part of current ddb allocation loop, iff we
have a chance of enabling sagv. And probably if we don't have enough
room for the sagv wms we should still try to allocate based on the
normal level 0 wm and mark sagv as no go.
Not quite sure what we should do with the cursor ddb since we don't
want to change that needlessly. I guess we could just have it compute
also the sagv wm and if that succeeds then bump the ddb allocation
if needed.
> + return 0;
> +}
> +
> +static const struct skl_wm_level *
> +skl_plane_wm_level(struct intel_plane *plane,
> + const struct intel_crtc_state *crtc_state,
> + int level,
> + bool yuv)
s/bool yuv/int color_plane/ to match existing code.
> +{
> + struct drm_atomic_state *state = crtc_state->uapi.state;
> + enum plane_id plane_id = plane->id;
> + const struct skl_plane_wm *wm =
> + &crtc_state->wm.skl.optimal.planes[plane_id];
> +
> + /*
> + * Looks ridicilous but need to check if state is not
> + * NULL here as it might be as some cursor plane manipulations
> + * seem to happen when no atomic state is actually present,
> + * despite crtc_state is allocated. Removing state check
> + * from here will result in kernel panic on boot.
> + * However we now need to check whether should be use SAGV
> + * wm levels here.
> + */
Should really find out what is happening instead of papering over it.
> + if (state) {
> + struct intel_atomic_state *intel_state =
> + to_intel_atomic_state(state);
> + if (intel_can_enable_sagv(intel_state) && !level)
> + return &wm->sagv_wm0;
> + }
> +
> + return yuv ? &wm->uv_wm[level] : &wm->wm[level];
> +}
> +
> static int
> skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> struct skl_ddb_allocation *ddb /* out */)
> @@ -4256,6 +4468,9 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> u16 uv_total[I915_MAX_PLANES] = {};
> u64 total_data_rate;
> enum plane_id plane_id;
> + struct intel_plane *plane;
> + const struct skl_wm_level *wm_level;
> + const struct skl_wm_level *wm_uv_level;
Needlessly wide scope.
> int num_active;
> u64 plane_data_rate[I915_MAX_PLANES] = {};
> u64 uv_plane_data_rate[I915_MAX_PLANES] = {};
> @@ -4307,12 +4522,15 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> */
> for (level = ilk_wm_max_level(dev_priv); level >= 0; level--) {
> blocks = 0;
> - for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> - const struct skl_plane_wm *wm =
> - &crtc_state->wm.skl.optimal.planes[plane_id];
> + for_each_intel_plane_on_crtc(&dev_priv->drm, intel_crtc, plane) {
> + plane_id = plane->id;
> + wm_level = skl_plane_wm_level(plane, crtc_state,
> + level, false);
> + wm_uv_level = skl_plane_wm_level(plane, crtc_state,
> + level, true);
>
> if (plane_id == PLANE_CURSOR) {
> - if (WARN_ON(wm->wm[level].min_ddb_alloc >
> + if (WARN_ON(wm_level->min_ddb_alloc >
> total[PLANE_CURSOR])) {
> blocks = U32_MAX;
> break;
> @@ -4320,8 +4538,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> continue;
> }
>
> - blocks += wm->wm[level].min_ddb_alloc;
> - blocks += wm->uv_wm[level].min_ddb_alloc;
> + blocks += wm_level->min_ddb_alloc;
> + blocks += wm_uv_level->min_ddb_alloc;
> }
>
> if (blocks <= alloc_size) {
> @@ -4342,12 +4560,16 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> * watermark level, plus an extra share of the leftover blocks
> * proportional to its relative data rate.
> */
> - for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> - const struct skl_plane_wm *wm =
> - &crtc_state->wm.skl.optimal.planes[plane_id];
> + for_each_intel_plane_on_crtc(&dev_priv->drm, intel_crtc, plane) {
> u64 rate;
> u16 extra;
>
> + plane_id = plane->id;
These s/plane_id/plane/ changes seem a bit pointless. Just churn with
no functional difference AFAICS.
> + wm_level = skl_plane_wm_level(plane, crtc_state,
> + level, false);
> + wm_uv_level = skl_plane_wm_level(plane, crtc_state,
> + level, true);
The introduction of skl_plane_wm_level() could be a separate patch.
> +
> if (plane_id == PLANE_CURSOR)
> continue;
>
> @@ -4362,7 +4584,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> extra = min_t(u16, alloc_size,
> DIV64_U64_ROUND_UP(alloc_size * rate,
> total_data_rate));
> - total[plane_id] = wm->wm[level].min_ddb_alloc + extra;
> + total[plane_id] = wm_level->min_ddb_alloc + extra;
> alloc_size -= extra;
> total_data_rate -= rate;
>
> @@ -4373,7 +4595,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> extra = min_t(u16, alloc_size,
> DIV64_U64_ROUND_UP(alloc_size * rate,
> total_data_rate));
> - uv_total[plane_id] = wm->uv_wm[level].min_ddb_alloc + extra;
> + uv_total[plane_id] = wm_uv_level->min_ddb_alloc + extra;
> alloc_size -= extra;
> total_data_rate -= rate;
> }
> @@ -4414,9 +4636,14 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> * that aren't actually possible.
> */
> for (level++; level <= ilk_wm_max_level(dev_priv); level++) {
> - for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> + for_each_intel_plane_on_crtc(&dev_priv->drm, intel_crtc, plane) {
> struct skl_plane_wm *wm =
> - &crtc_state->wm.skl.optimal.planes[plane_id];
> + &crtc_state->wm.skl.optimal.planes[plane->id];
> +
> + wm_level = skl_plane_wm_level(plane, crtc_state,
> + level, false);
> + wm_uv_level = skl_plane_wm_level(plane, crtc_state,
> + level, true);
>
> /*
> * We only disable the watermarks for each plane if
> @@ -4430,9 +4657,10 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> * planes must be enabled before the level will be used."
> * So this is actually safe to do.
> */
> - if (wm->wm[level].min_ddb_alloc > total[plane_id] ||
> - wm->uv_wm[level].min_ddb_alloc > uv_total[plane_id])
> - memset(&wm->wm[level], 0, sizeof(wm->wm[level]));
> + if (wm_level->min_ddb_alloc > total[plane->id] ||
> + wm_uv_level->min_ddb_alloc > uv_total[plane->id])
> + memset(&wm->wm[level], 0,
> + sizeof(struct skl_wm_level));
>
> /*
> * Wa_1408961008:icl, ehl
> @@ -4440,9 +4668,14 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
> */
> if (IS_GEN(dev_priv, 11) &&
> level == 1 && wm->wm[0].plane_en) {
> - wm->wm[level].plane_res_b = wm->wm[0].plane_res_b;
> - wm->wm[level].plane_res_l = wm->wm[0].plane_res_l;
> - wm->wm[level].ignore_lines = wm->wm[0].ignore_lines;
> + wm_level = skl_plane_wm_level(plane, crtc_state,
> + 0, false);
> + wm->wm[level].plane_res_b =
> + wm_level->plane_res_b;
> + wm->wm[level].plane_res_l =
> + wm_level->plane_res_l;
> + wm->wm[level].ignore_lines =
> + wm_level->ignore_lines;
> }
> }
> }
> @@ -4671,12 +4904,12 @@ static bool skl_wm_has_lines(struct drm_i915_private *dev_priv, int level)
>
> static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
> int level,
> + u32 latency,
> const struct skl_wm_params *wp,
> const struct skl_wm_level *result_prev,
> struct skl_wm_level *result /* out */)
> {
> struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
> - u32 latency = dev_priv->wm.skl_latency[level];
> uint_fixed_16_16_t method1, method2;
> uint_fixed_16_16_t selected_result;
> u32 res_blocks, res_lines, min_ddb_alloc = 0;
> @@ -4797,20 +5030,46 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
> static void
> skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
> const struct skl_wm_params *wm_params,
> - struct skl_wm_level *levels)
> + struct skl_plane_wm *plane_wm,
> + bool yuv)
> {
> struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
> int level, max_level = ilk_wm_max_level(dev_priv);
> + /*
> + * Check which kind of plane is it and based on that calculate
> + * correspondent WM levels.
> + */
> + struct skl_wm_level *levels = yuv ? plane_wm->uv_wm : plane_wm->wm;
> struct skl_wm_level *result_prev = &levels[0];
>
> for (level = 0; level <= max_level; level++) {
> struct skl_wm_level *result = &levels[level];
> + u32 latency = dev_priv->wm.skl_latency[level];
>
> - skl_compute_plane_wm(crtc_state, level, wm_params,
> - result_prev, result);
> + skl_compute_plane_wm(crtc_state, level, latency,
> + wm_params, result_prev, result);
>
> result_prev = result;
> }
> + /*
> + * For Gen12 if it is an L0 we need to also
> + * consider sagv_block_time when calculating
> + * L0 watermark - we will need that when making
> + * a decision whether enable SAGV or not.
> + * For older gens we agreed to copy L0 value for
> + * compatibility.
> + */
> + if ((INTEL_GEN(dev_priv) >= 12)) {
> + u32 latency = dev_priv->wm.skl_latency[0];
> +
> + latency += dev_priv->sagv_block_time_us;
> + skl_compute_plane_wm(crtc_state, 0, latency,
> + wm_params, &levels[0],
> + &plane_wm->sagv_wm0);
> + } else {
> + memcpy(&plane_wm->sagv_wm0, &levels[0],
> + sizeof(struct skl_wm_level));
Simple assignments should do.
> + }
> }
>
> static u32
> @@ -4903,7 +5162,7 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
> if (ret)
> return ret;
>
> - skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
> + skl_compute_wm_levels(crtc_state, &wm_params, wm, false);
> skl_compute_transition_wm(crtc_state, &wm_params, wm);
>
> return 0;
> @@ -4925,7 +5184,7 @@ static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
> if (ret)
> return ret;
>
> - skl_compute_wm_levels(crtc_state, &wm_params, wm->uv_wm);
> + skl_compute_wm_levels(crtc_state, &wm_params, wm, true);
>
> return 0;
> }
> @@ -5062,10 +5321,13 @@ void skl_write_plane_wm(struct intel_plane *plane,
> &crtc_state->wm.skl.plane_ddb_y[plane_id];
> const struct skl_ddb_entry *ddb_uv =
> &crtc_state->wm.skl.plane_ddb_uv[plane_id];
> + const struct skl_wm_level *wm_level;
>
> for (level = 0; level <= max_level; level++) {
> + wm_level = skl_plane_wm_level(plane, crtc_state, level, false);
> +
> skl_write_wm_level(dev_priv, PLANE_WM(pipe, plane_id, level),
> - &wm->wm[level]);
> + wm_level);
> }
> skl_write_wm_level(dev_priv, PLANE_WM_TRANS(pipe, plane_id),
> &wm->trans_wm);
> @@ -5096,10 +5358,13 @@ void skl_write_cursor_wm(struct intel_plane *plane,
> &crtc_state->wm.skl.optimal.planes[plane_id];
> const struct skl_ddb_entry *ddb =
> &crtc_state->wm.skl.plane_ddb_y[plane_id];
> + const struct skl_wm_level *wm_level;
>
> for (level = 0; level <= max_level; level++) {
> + wm_level = skl_plane_wm_level(plane, crtc_state, level, false);
> +
> skl_write_wm_level(dev_priv, CUR_WM(pipe, level),
> - &wm->wm[level]);
> + wm_level);
> }
> skl_write_wm_level(dev_priv, CUR_WM_TRANS(pipe), &wm->trans_wm);
>
> @@ -5473,18 +5738,68 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
> return 0;
> }
>
> +static void tgl_compute_sagv_mask(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> + struct intel_crtc *crtc;
> + struct intel_crtc_state *new_crtc_state;
> + struct intel_crtc_state *old_crtc_state;
> + struct skl_ddb_allocation *ddb = &state->wm_results.ddb;
> + int ret;
> + int i;
> + struct intel_plane *plane;
> +
> + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> + new_crtc_state, i) {
> + int pipe_bit = BIT(crtc->pipe);
> + bool skip = true;
> +
> + /*
> + * If we had set this mast already once for this state,
> + * no need to waste CPU cycles for doing this again.
> + */
> + for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
> + enum plane_id plane_id = plane->id;
> +
> + if (!skl_plane_wm_equals(dev_priv,
> + &old_crtc_state->wm.skl.optimal.planes[plane_id],
> + &new_crtc_state->wm.skl.optimal.planes[plane_id])) {
> + skip = false;
> + break;
> + }
> + }
> +
> + /*
> + * Check if wm levels are actually the same as for previous
> + * state, which means we can just skip doing this long check
> + * and just copy correspondent bit from previous state.
> + */
> + if (skip)
> + continue;
> +
> + ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> + if (!ret)
> + state->crtc_sagv_mask |= pipe_bit;
> + else
> + state->crtc_sagv_mask &= ~pipe_bit;
> + }
> +}
> +
> static int
> skl_compute_wm(struct intel_atomic_state *state)
> {
> struct intel_crtc *crtc;
> struct intel_crtc_state *new_crtc_state;
> struct intel_crtc_state *old_crtc_state;
> - struct skl_ddb_values *results = &state->wm_results;
> int ret, i;
> + struct skl_ddb_values *results = &state->wm_results;
>
> /* Clear all dirty flags */
> results->dirty_pipes = 0;
>
> + /* No SAGV until we check if it's possible */
> + state->crtc_sagv_mask = 0;
> +
> ret = skl_ddb_add_affected_pipes(state);
> if (ret)
> return ret;
> @@ -5664,6 +5979,9 @@ void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
> val = I915_READ(CUR_WM(pipe, level));
>
> skl_wm_level_from_reg_val(val, &wm->wm[level]);
> + if (level == 0)
> + memcpy(&wm->sagv_wm0, &wm->wm[level],
> + sizeof(struct skl_wm_level));
> }
>
> if (plane_id != PLANE_CURSOR)
> diff --git a/drivers/gpu/drm/i915/intel_pm.h b/drivers/gpu/drm/i915/intel_pm.h
> index c06c6a846d9a..4136d4508e63 100644
> --- a/drivers/gpu/drm/i915/intel_pm.h
> +++ b/drivers/gpu/drm/i915/intel_pm.h
> @@ -43,6 +43,7 @@ void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
> void g4x_wm_sanitize(struct drm_i915_private *dev_priv);
> void vlv_wm_sanitize(struct drm_i915_private *dev_priv);
> bool intel_can_enable_sagv(struct intel_atomic_state *state);
> +bool intel_has_sagv(struct drm_i915_private *dev_priv);
> int intel_enable_sagv(struct drm_i915_private *dev_priv);
> int intel_disable_sagv(struct drm_i915_private *dev_priv);
> bool skl_wm_level_equals(const struct skl_wm_level *l1,
> --
> 2.17.1
--
Ville Syrjälä
Intel
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